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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
use api::ColorF;
use api::units::*;
use crate::pattern::{
Pattern, PatternBuilder, PatternBuilderContext, PatternBuilderState, PatternKind,
PatternShaderInput, PatternTextureInput,
};
use crate::render_task_graph::RenderTaskId;
use crate::renderer::BlendMode;
/// Applies a CSS/SVG filter to a source render task via the ps_quad_blend
/// shader.
pub struct BlendFilterPattern {
pub src_task_id: RenderTaskId,
/// The filter mode (see `Filter::as_int`) in the low 16 bits, plus the
/// per-channel component-transfer functions in the high bits.
pub filter_mode: i32,
/// Either the filter "amount" (fixed point, scaled by 65536) for scalar
/// filters, or a GPU buffer address for matrix / component-transfer filters.
pub param: i32,
}
impl PatternBuilder for BlendFilterPattern {
fn build(
&self,
_sub_rect: Option<DeviceRect>,
_offset: LayoutVector2D,
_ctx: &PatternBuilderContext,
_state: &mut PatternBuilderState,
) -> Pattern {
Pattern {
kind: PatternKind::Blend,
shader_input: PatternShaderInput(self.filter_mode, self.param),
texture_input: PatternTextureInput::new(self.src_task_id),
base_color: ColorF::WHITE,
// Filters may change the alpha (e.g. color matrix, flood), so the
// result is treated as translucent.
is_opaque: false,
blend_mode: BlendMode::PremultipliedAlpha,
}
}
}